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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../to_chars.html" title="cpp/utility/to chars"><span class="t-lines"><span>to_chars</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../from_chars.html" title="cpp/utility/from chars"><span class="t-lines"><span>from_chars</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../chars_format.html" title="cpp/utility/chars format"><span class="t-lines"><span>chars_format</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 类型运算</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../declval.html" title="cpp/utility/declval"><span class="t-lines"><span>declval</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../as_const.html" title="cpp/utility/as const"><span class="t-lines"><span>as_const</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../launder.html" title="cpp/utility/launder"><span class="t-lines"><span>launder</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../tuple.html" title="cpp/utility/tuple"><tt>std::tuple</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> 成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tuple.html" title="cpp/utility/tuple/tuple"><span class="t-lines"><span>tuple::tuple</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>tuple::operator=</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="swap.html" title="cpp/utility/tuple/swap"><span class="t-lines"><span>tuple::swap</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 非成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="make_tuple.html" title="cpp/utility/tuple/make tuple"><span class="t-lines"><span>make_tuple</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tie.html" title="cpp/utility/tuple/tie"><span class="t-lines"><span>tie</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="forward_as_tuple.html" title="cpp/utility/tuple/forward as tuple"><span class="t-lines"><span>forward_as_tuple</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tuple_cat.html" title="cpp/utility/tuple/tuple cat"><span class="t-lines"><span>tuple_cat</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator_cmp.html" title="cpp/utility/tuple/operator cmp"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&lt;=</span><span>operator&gt;</span><span>operator&gt;=</span><span>operator&lt;=&gt;</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="swap2.html" title="cpp/utility/tuple/swap2"><span class="t-lines"><span>std::swap</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="get.html" title="cpp/utility/tuple/get"><span class="t-lines"><span>get</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> <a href="deduction_guides.html" title="cpp/utility/tuple/deduction guides">推导指引</a><span class="t-mark-rev t-since-cxx17">(C++17)</span></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 辅助类</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tuple_size.html" title="cpp/utility/tuple/tuple size"><span class="t-lines"><span>tuple_size</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tuple_element.html" title="cpp/utility/tuple/tuple element"><span class="t-lines"><span>tuple_element</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="uses_allocator.html" title="cpp/utility/tuple/uses allocator"><span class="t-lines"><span>uses_allocator</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ignore.html" title="cpp/utility/tuple/ignore"><span class="t-lines"><span>ignore</span></span></a></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp">tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> tuple<span class="sy3">&amp;</span> other <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> <br><span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> tuple<span class="sy3">&amp;</span> other <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(2)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp">tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> tuple<span class="sy3">&amp;&amp;</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="coMULTI">/* see below */</span><span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> <br><span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> tuple<span class="sy3">&amp;&amp;</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="coMULTI">/* see below */</span><span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(3)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span>... <span class="me1">UTypes</span> <span class="sy1">&gt;</span><br>
tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> tuple<span class="sy1">&lt;</span>UTypes...<span class="sy1">&gt;</span><span class="sy3">&amp;</span> other <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> <br><span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span>... <span class="me1">UTypes</span> <span class="sy1">&gt;</span><br>
<span class="kw4">constexpr</span> tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> tuple<span class="sy1">&lt;</span>UTypes...<span class="sy1">&gt;</span><span class="sy3">&amp;</span> other <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(4)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span>... <span class="me1">UTypes</span> <span class="sy1">&gt;</span><br>
tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> tuple<span class="sy1">&lt;</span>UTypes...<span class="sy1">&gt;</span><span class="sy3">&amp;&amp;</span> other <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> <br><span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span>... <span class="me1">UTypes</span> <span class="sy1">&gt;</span><br>
<span class="kw4">constexpr</span> tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> tuple<span class="sy1">&lt;</span>UTypes...<span class="sy1">&gt;</span><span class="sy3">&amp;&amp;</span> other <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(5)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> U1, <span class="kw1">class</span> U2 <span class="sy1">&gt;</span><br>
tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> pair<span class="sy1">&lt;</span>U1,U2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> p <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> <br><span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> U1, <span class="kw1">class</span> U2 <span class="sy1">&gt;</span><br>
<span class="kw4">constexpr</span> tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> pair<span class="sy1">&lt;</span>U1,U2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> p <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(6)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> U1, <span class="kw1">class</span> U2 <span class="sy1">&gt;</span><br>
tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> pair<span class="sy1">&lt;</span>U1,U2<span class="sy1">&gt;</span><span class="sy3">&amp;&amp;</span> p <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> <br><span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> U1, <span class="kw1">class</span> U2 <span class="sy1">&gt;</span><br>
<span class="kw4">constexpr</span> tuple<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> pair<span class="sy1">&lt;</span>U1,U2<span class="sy1">&gt;</span><span class="sy3">&amp;&amp;</span> p <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </td>
</tr>
</tbody><tbody>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>以另一 <code>tuple</code> 或 <code>pair</code> 的内容替换 <code>tuple</code> 的内容。
</p><p>1) 复制赋值运算符。复制赋值 <code>other</code> 的每个元素给 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的对应元素。
</p><p>2) 移动赋值运算符。对所有 <code>i</code> ，赋值 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>Ti<span class="sy1">&gt;</span><span class="br0">(</span>get<span class="sy1">&lt;</span>i<span class="sy1">&gt;</span><span class="br0">(</span>other<span class="br0">)</span><span class="br0">)</span></span></span> 给 <span class="t-c"><span class="mw-geshi cpp source-cpp">get<span class="sy1">&lt;</span>i<span class="sy1">&gt;</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span></span></span> 。 
</p><p>3) 对所有 <code>i</code> ，赋 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span>i<span class="sy1">&gt;</span><span class="br0">(</span>other<span class="br0">)</span></span></span> 给 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span>i<span class="sy1">&gt;</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span></span></span> 。
</p><p>4) 对所有 <code>i</code> ，赋 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>Ui<span class="sy1">&gt;</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span>i<span class="sy1">&gt;</span><span class="br0">(</span>other<span class="br0">)</span><span class="br0">)</span></span></span> 给 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span>i<span class="sy1">&gt;</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span></span></span> 。
</p><p>5) 赋 <span class="t-c"><span class="mw-geshi cpp source-cpp">p.<span class="me1">first</span></span></span> 给 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的首元素并赋 <span class="t-c"><span class="mw-geshi cpp source-cpp">p.<span class="me1">second</span></span></span> 给 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的第二元素。
</p><p>6) 赋 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U1<span class="sy1">&gt;</span><span class="br0">(</span>p.<span class="me1">first</span><span class="br0">)</span></span></span> 给 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的首元素并赋 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U2<span class="sy1">&gt;</span><span class="br0">(</span>p.<span class="me1">second</span><span class="br0">)</span></span></span> 给 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的第二元素。
</p>
 <table class="t-rev-begin">
<tr class="t-rev t-until-cxx17"><td>
<p>这些函数的行为未定义，除非：
</p>
<ul><li> 对于 <span class="t-v">(1)</span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_copy_assignable.html"><span class="kw550">std::<span class="me2">is_copy_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对 <code>Types</code> 中所有 <code>T_i</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> 对于 <span class="t-v">(2)</span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_move_assignable.html"><span class="kw556">std::<span class="me2">is_move_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对 <code>Types</code> 中所有 <code>T_i</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> 对于 <span class="t-v">(3)</span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>UTypes<span class="br0">)</span> <span class="sy1">==</span> sizeof...<span class="br0">(</span>Types<span class="br0">)</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy3">&amp;</span>, <span class="kw4">const</span> U_i<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对所有 <code>Types</code> 中的 <code>T_i</code> 和 <code>UTypes</code> 中的 <code>U_i</code> 的对应对为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> 对于 <span class="t-v">(4)</span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>UTypes<span class="br0">)</span> <span class="sy1">==</span> sizeof...<span class="br0">(</span>Types<span class="br0">)</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy3">&amp;</span>, U_i<span class="sy3">&amp;&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对所有 <code>Types</code> 中的 <code>T_i</code> 和 <code>UTypes</code> 中的 <code>U_i</code> 的对应对为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> 对于 <span class="t-v">(5)</span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>Types<span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">2</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_0<span class="sy3">&amp;</span>, <span class="kw4">const</span> U1<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_1<span class="sy3">&amp;</span>, <span class="kw4">const</span> U2<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 都是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，其中 <code>T_0</code> 与 <code>T_1</code> 是组成 <code>Types</code> 的二个类型。
</li><li> 对于 <span class="t-v">(6)</span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>Types<span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">2</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_0<span class="sy3">&amp;</span>, U1<span class="sy3">&amp;&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_1<span class="sy3">&amp;</span>, U2<span class="sy3">&amp;&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 都是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，其中 <code>T_0</code> 与 <code>T_1</code> 是组成 <code>Types</code> 的二个类型。
</li></ul>
</td>
<td><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td></tr>
<tr class="t-rev t-since-cxx17"><td>
<p>这些函数不参与重载决议（或对于复制赋值运算符，为定义为被删除），若任何要求的赋值运算非法或若存在大小不匹配。特别是：
</p>
<ul><li> <span class="t-v">(1)</span> 定义为被删除，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_copy_assignable.html"><span class="kw550">std::<span class="me2">is_copy_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对 <code>Types</code> 中所有 <code>T_i</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> <span class="t-v">(2)</span> 不参与重载决议，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_move_assignable.html"><span class="kw556">std::<span class="me2">is_move_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对 <code>Types</code> 中所有 <code>T_i</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> <span class="t-v">(3)</span> 不参与重载决议，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>UTypes<span class="br0">)</span> <span class="sy1">==</span> sizeof...<span class="br0">(</span>Types<span class="br0">)</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy3">&amp;</span>, <span class="kw4">const</span> U_i<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对所有 <code>Types</code> 中的 <code>T_i</code> 和 <code>UTypes</code> 中的 <code>U_i</code> 的对应对为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> <span class="t-v">(4)</span> 不参与重载决议，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>UTypes<span class="br0">)</span> <span class="sy1">==</span> sizeof...<span class="br0">(</span>Types<span class="br0">)</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_i<span class="sy3">&amp;</span>, U_i<span class="sy3">&amp;&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对所有 <code>Types</code> 中的 <code>T_i</code> 和 <code>UTypes</code> 中的 <code>U_i</code> 的对应对为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li><li> <span class="t-v">(5)</span> 不参与重载决议，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>Types<span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">2</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_0<span class="sy3">&amp;</span>, <span class="kw4">const</span> U1<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_1<span class="sy3">&amp;</span>, <span class="kw4">const</span> U2<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 都是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，其中 <code>T_0</code> 与 <code>T_1</code> 是组成 <code>Types</code> 的二个类型。
</li><li> <span class="t-v">(6)</span> 不参与重载决议，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>Types<span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">2</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_0<span class="sy3">&amp;</span>, U1<span class="sy3">&amp;&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_assignable.html"><span class="kw544">std::<span class="me2">is_assignable</span></span></a><span class="sy1">&lt;</span>T_1<span class="sy3">&amp;</span>, U2<span class="sy3">&amp;&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span></span></span> 都是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，其中 <code>T_0</code> 与 <code>T_1</code> 是组成 <code>Types</code> 的二个类型。
</li></ul>
</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td></tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  other
</td>
<td> -
</td>
<td> 要替换此 <code>tuple</code> 内容的 <code>tuple</code>
</td></tr>
<tr class="t-par">
<td>  p
</td>
<td> -
</td>
<td> 要替换此 2-tuple 内容的 <code>pair</code>
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span>
</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
<p>1) （无）
</p>
2) <div class="t-noexcept-full"><a href="../../language/noexcept_spec.html" title="cpp/language/noexcept spec"><tt>noexcept</tt></a> 规定：  
<div class="t-noexcept-box"><span class="t-cc"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span><br>
<p>    is_nothrow_move_assignable<span class="sy1">&lt;</span>T0<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span> <span class="sy3">&amp;&amp;</span><br>
    is_nothrow_move_assignable<span class="sy1">&lt;</span>T1<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span> <span class="sy3">&amp;&amp;</span><br>
    is_nothrow_move_assignable<span class="sy1">&lt;</span>T2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span> <span class="sy3">&amp;&amp;</span><br>
    ...<br>
</p>
<span class="br0">)</span></span></span></div></div>
<p>3-6) （无）
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr><td class="mbox-empty-cell"></td><td class="mbox-text" style="">本节未完成<br>原因：暂无示例 </td></tr></table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">
<tr><td></td></tr></table>

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